Table 2 Medical characteristics of study participants

Total number of women

8,746 (100%)

15,857 (100%)

36,185 (100%)

33,468 (100%)

2,931 (100%)

97,187 (100%)

Gynaecological history

IUD user status

 First-time user

6,682 (76.4%)

12,209 (77.0%)

18,784 (51.9%)

22,525 (67.3%)

2,072 (70.7%)

62,272 (64.1%)

 Repeated user

1,117 (12.8%)

2,028 (12.8%)

7,602 (21.0%)

6,773 (20.2%)

469 (16.0%)

17,989 (18.5%)

 Consecutive user

932 (10.7%)

1546 (9.7%)

9,706 (26.8%)

4,083 (12.2%)

387 (13.2%)

16,654 (17.1%)

Ever been pregnant (Gravidity)

Thereof

3,374 (38.6%)

8,279 (52.2%)

31,467 (87.0%)

21,543 (64.4%)

2,632 (89.8%)

67,295 (69.2%)

 Ever had a termination/miscarriage/ stillbirth^a

1,570 (46.5%)

3,446 (41.6%)

11,794 (37.5%)

9,821 (45.6%)

822 (31.2%)

27,453 (40.8%)

 At least one live birth^a

2,678 (79.4%)

7,379 (89.1%)

30,566 (97.1%)

19,381 (90.0%)

2,580 (98.0%)

62,584 (93.0%)

 Ever had an ectopic pregnancy^a

59 (1.7%)

185 (2.2%)

664 (2.1%)

404 (1.9%)

62 (2.4%)

1,374 (2.0%)

Number of pregnancies [Mean ± SD]^a

1.9 ± 1.2

2.1 ± 1.2

2.5 ± 1.3

2.4 ± 1.4

2.3 ± 1.2

2.4 ± 1.3

Breastfeeding at time of IUD insertion^b

761 (28.4%)

1,853 (25.1%)

4,710 (15.4%)

4,400 (22.7%)

585 (22.7%)

12,309 (19.7%)

Medical history^c

PE or DVT

80 (0.9%)

116 (0.7%)

403 (1.1%)

357 (1.1%)

25 (0.9%)

981 (1.0%)

Endometriosis

86 (1.0%)

194 (1.2%)

1,111 (3.1%)

170 (0.5%)

73 (2.5%)

1,634 (1.7%)

Benign tumor of the uterus

68 (0.8%)

167 (1.1%)

906 (2.5%)

273 (0.8%)

109 (3.7%)

1,523 (1.6%)

Sexually transmitted diseases

654 (7.5%)

972 (6.1%)

2,211 (6.1%)

1,985 (5.9%)

72 (2.5%)

5,894 (6.1%)

Cancer

37 (0.4%)

101 (0.6%)

295 (0.8%)

260 (0.8%)

22 (0.8%)

715 (0.7%)

Other serious diseases

359 (4.1%)

740 (4.7%)

1,757 (4.9%)

1,318 (3.9%)

142 (4.8%)

4,316 (4.4%)

Any surgery

2,405 (27.5%)

4,629 (29.2%)

12,366 (34.2%)

9,514 (28.4%)

961 (32.8%)

29,875 (30.7%)